Most mattress manufacturers offer beds in twin, twin XL, full, queen, king and California king sizes. Some brands also make mattresses for cribs, toddlers and futons. These mattresses range in size from small twin spreads, which are approximately 38 inches wide and just under 75 inches long, to California kings, which are 72 inches wide and just under 84 inches long.
Twin-size mattresses are the smallest in the standard size lineup. They come in standard sizes and an extended version, called twin XL. These beds are also just under 40 inches wide, but are about 5 inches longer than traditional twins. They are popular in small spaces, such as college dormitories.
Full-size mattresses are about 15 inches wider than twin beds, but they are roughly the same length. These mattresses can accommodate two sleepers, but only yield about 25 inches of personal space. They are best for people under 5 feet, 5 inches tall, say experts at The Better Sleep Council.
Queen mattresses are about 60 inches wide and 80 inches long. Those dimensions vary among retailers, says Serta, as does mattress height and material composition. These mattresses provide couples with approximately 30 inches of personal space. They are ideal for single sleepers who toss and turn, too.
King mattresses are approximately 15 inches wider than standard queens, and roughly the same length. They are commonly placed in master bedrooms. King mattresses provide couples with about as much personal space as if they were sleeping alone on a twin bed. They are good for families with young kids and pets, as there is also room for toddlers and small animals.